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Bennett" Cc: Takashi Iwai , linux-sound@vger.kernel.org Subject: Re: ALSA: usb-audio: SKIP_IFACE_SETUP regression on Focusrite Scarlett 2i2 (1235:8006) In-Reply-To: References: User-Agent: Wanderlust/2.15.9 (Almost Unreal) Emacs/30.2 Mule/6.0 Precedence: bulk X-Mailing-List: linux-sound@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 (generated by SEMI-EPG 1.14.7 - "Harue") Content-Type: text/plain; charset=US-ASCII X-Spam-Score: -3.30 X-Spam-Level: X-Spamd-Result: default: False [-3.30 / 50.00]; BAYES_HAM(-3.00)[99.99%]; MID_CONTAINS_FROM(1.00)[]; NEURAL_HAM_LONG(-1.00)[-1.000]; NEURAL_HAM_SHORT(-0.20)[-1.000]; MIME_GOOD(-0.10)[text/plain]; RCVD_VIA_SMTP_AUTH(0.00)[]; ARC_NA(0.00)[]; RCVD_TLS_ALL(0.00)[]; TO_DN_SOME(0.00)[]; MIME_TRACE(0.00)[0:+]; FUZZY_RATELIMITED(0.00)[rspamd.com]; DKIM_SIGNED(0.00)[suse.de:s=susede2_rsa,suse.de:s=susede2_ed25519]; TO_MATCH_ENVRCPT_ALL(0.00)[]; FROM_HAS_DN(0.00)[]; RCPT_COUNT_THREE(0.00)[3]; FROM_EQ_ENVFROM(0.00)[]; RCVD_COUNT_TWO(0.00)[2]; DBL_BLOCKED_OPENRESOLVER(0.00)[imap1.dmz-prg2.suse.org:helo,suse.de:mid] X-Spam-Flag: NO On Sun, 15 Mar 2026 20:20:54 +0100, Geoffrey D. Bennett wrote: > > Hi Takashi, > > A user reported distorted/silent audio on 6.19.7 with a Focusrite 1st > Generation Scarlett 2i2 (1235:8006), caused by 38c322068a26 ("ALSA: > usb-audio: Add QUIRK_FLAG_SKIP_IFACE_SETUP"). > > The Feedback Format (from /proc stream0) changes from 16.16 to 17.15 > when SKIP_IFACE_SETUP is enabled. The user confirmed that removing > SKIP_IFACE_SETUP fixes the issue. > > This device doesn't have the internal mixer, Air, or Safe modes that > the quirk was designed to protect, so it doesn't benefit from the > skip. > > I'm not sure if there's a better fix than explicitly listing all the > devices that I tested? > > E.g. replace: > > VENDOR_FLG(0x1235, /* Focusrite Novation */ > QUIRK_FLAG_SKIP_CLOCK_SELECTOR | > QUIRK_FLAG_SKIP_IFACE_SETUP), > > with ~23 of these: > > DEVICE_FLG(0x1235, 0x8203, /* Focusrite Scarlett 2nd Gen 6i6 */ > QUIRK_FLAG_SKIP_CLOCK_SELECTOR | > QUIRK_FLAG_SKIP_IFACE_SETUP), > > What do you think? > > Report: https://github.com/geoffreybennett/linux-fcp/issues/54 We can put DEVICE_FLG() entries for the known Focusrite devices that shouldn't to set QUIRK_FLAG_SKIP_IFACE_SETUP before the VENDOR_FLG() entry that keeps *_SKIP_IFACE_SETUP flag? thanks, Takashi